If you have a small enough patch you can put row cover over them until they get bigger. Inspect them to make sure there are no bugs on them first. Basil is delicate so make supports with sticks so the weight of the cloth isn't on them. My zucchini always gets decimated by squash bugs so I put row cover on them when I transplant, leaving slack so they can push it up. I take it off when they are about to blossom. By then they are big and strong and the bugs have settled in on someone else's squash.

Squash bugs have piercing mouth parts and aren't that likely to make holes unless the holes come from the necrotic tissue around the point that they sucked from.

Dish soap is likely the best best if it's a soft bodied insect such as a caterpillar. Catch one and post a picture and someone will likely be able to ID it for you. I took a tonne of entomology courses in my younger days and I'd be happy to try to help.